Scope of PHP

This article mainly introduces the scope of PHP, has a certain reference value, now share to everyone, the need for friends can refer to

The area to which the variable can be accessed.
JS in scope:
Global scope: can be used anywhere (outside the function and inside the function)
Local scope: Can only be used inside a function

PHP also has two scopes: global scope and local scope
Global scope: can only be used outside the function
Local scope: Can only be used inside a function

Global scope refers to a variable defined outside a function, and a local scope refers to a variable defined inside a function
Internal cannot access external

External cannot access internal

Global scope can be accessed using $globals[' global scope variable ' in a local scope

Note: $GLOBALS is a variable that refers to the global scope itself

PHP also provides a keyword: global
Global is the address of the variable of the global scope, replicates it, and creates a new variable name with the same name within the local scope, assigning the external address to the local variable.
Syntax: global variable name;
Variable name = value;

The area to which the variable can be accessed.
JS in scope:
Global scope: can be used anywhere (outside the function and inside the function)
Local scope: Can only be used inside a function

PHP also has two scopes: global scope and local scope
Global scope: can only be used outside the function
Local scope: Can only be used inside a function

Global scope refers to a variable defined outside a function, and a local scope refers to a variable defined inside a function
Internal cannot access external

External cannot access internal

Global scope can be accessed using $globals[' global scope variable ' in a local scope

Note: $GLOBALS is a variable that refers to the global scope itself

PHP also provides a keyword: global
Global is the address of the variable of the global scope, replicates it, and creates a new variable name with the same name within the local scope, assigning the external address to the local variable.
Syntax: global variable name;
Variable name = value;

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